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Finding the Fourth Proportional to 687,450.79, 948,796.10 and 400,970.86

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Solution

The fourth proportional to 687,450.79, 948,796.10 and 400,970.86 is: 553,406.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,450.79 : 948,796.10 = 400,970.86 : x
  2. Step 2: Convert to fraction form
    687,450.79/948,796.10 = 400,970.86/x
  3. Step 3: Cross multiply
    687,450.79x = 948,796.10 × 400,970.86
  4. Step 4: Simplify right side
    687,450.79x = 380,439,588,181.65
  5. Step 5: Solve for x
    x = 380,439,588,181.65/687,450.79
  6. Step 6: Final answer
    x = 553,406.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.